I found this auction on ebay of Hughes' SDCC sketchbook. If you scroll down you'll see the drawings of Emma, Mary Jane, and Black Cat that are the supposed concepts for the statues with Sideshow. They look great to me!
https://cgi.ebay.com/Adam-Hughes-Ca...oryZ3986QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
https://cgi.ebay.com/Adam-Hughes-Ca...oryZ3986QQssPageNameZWDVWQQrdZ1QQcmdZViewItem